fix

Author: serezhka

src/main/java/com/github/serezhka/jap2server/internal/handler/audio/AudioHandler.java

@@ -65,6 +65,10 @@ protected void channelRead0(ChannelHandlerContext ctx, DatagramPacket msg) throw
 
         log.debug("Got audio packet. flag: {}, type: {}, length: {}", flag, type, contentLength);
 
+        if (!aacDecoderInitialized) {
+            return;
+        }
+
         if (type == 96 || type == 86) {
             int off = 0;
             if (type == 86) {